The GU-23A triode is used for generation and power amplification in stationary RF equipment.

GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glass-to-metal.
Cooling: forced (water for anode and leads of cathode and grid, air for stem, envelope and seals).
Height: at most 560 mm.
Diameter: at most 230 mm.
Mass: at most 11 kg.